VESPA 946 E4 EMEA 2021 Manual page 68

Maintenance
•
Prevent pollution of the canister with the liquid fuel (in case of fall of the vehicle, the valve
must block the connection with the canister).
To control the valve, it is necessary to remove it
from the vehicle.
For the check, it is planned to use a MITY-VAC
pump and a piece of tube, then proceed as follows:
•
Connect the MITY-VAC pump to the
lower joint of the safety valve (white).
•
Select the "vacuum" control position
and keeping the valve in the vertical
axis, check that it is possible to intake
air without movements of the gauge
needle.
•
Switch the control of the pump to "pres-
sure" and, keeping the valve in the ver-
tical axis, check that it is possible to
pressurise the valve up to values
slightly below 1.45PSI(~0.87PSI)
10kPa(~6kPa) 100mbar(~60mbar).
Note: The calibration pressure is easily identifia-
ble as when this pressure is reached, the valve
vents the air with a small sound.
•
Position the valve in the horizontal axis
and check that you can pressurise it to
values well above the setting pressure
(e.g. 7.25PSI (50 kPa) (0.5bar) without
guaranteeing the maintenance).
If you detect abnormal behaviour, replace the
valve.
Note: Any malfunction of the valve may cause de-
formation of the fuel tank or compromise canister
function.
MAIN - 68
Vespa 946 E4-E5 EMEA-USA-ASIA (2021-)